Lect01 - Physics 211 NEW NEW NEW NEW NEW NEW Old 75 minute lecture replaced by Online Prelectures(animated textbook(animated Online

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Unformatted text preview: Physics 211 NEW NEW NEW NEW NEW NEW Old 75 minute lecture replaced by: - Online Prelectures (animated textbook) (animated - Online Preflights (check knowledge before lecture) (check - Lectures (50 minutes; very interactive) Lectures (50 Physics 211 Lecture 1, Slide 1 Physics ACT 1 Do you have your i>clicker with you today? A) Yes B) No C) Maybe D) I like pudding Physics 211 Lecture 1, Slide 2 Physics ACT 2 Which of the following best describes your high-school physics class? A) Great B) Pretty good C) So-so D) Not so good E) Awful Physics 211 Lecture 1, Slide 3 Physics Physics 211 - Overview Overview http://online.physics.uiuc.edu/courses/phys211 Everything can be found online – use the Planner link use Planner link • You have web based pre-lectures and pre-flights due at 6am before You due every lecture. The next ones are due 6am Wednesday. every • You have web based homework due every week. You due Labs & Discussions • • LAB sections start at 1pm TODAY DISCUSSION sections start NEXT TUESDAY Physics 211 Lecture 1, Slide 4 Physics How your grade will be calculated Prelectures + Preflights + Lectures 100 14 Homework + 9 Quizzes 250 Labs 150 Hour exams (3 x 100 each) 300 Final Exam 200 Prelectures: 50 Preflight's: 25 Lecture participation: 25 The lowest score is dropped and your top 22 HW/Quiz scores determine your grade out of 250. Bonus Points: You can earn up to 1 extra bonus point in every You in lecture (for a maximum of 25 bonus points for the semester) by getting the right answers to at least 5 of the clicker questions. At the end of the semester you lecture bonus points are added to your HW/Quiz score (250 max). Register your clicker ASAP so you can see your lecture participation grade (see course web page) 04 Physics 211 Lecture 1, Slide 5 Physics Q: What are the benefits of participating ? A: You learn more 30 Viewer Non-Viewer 25 What we learned in Physics 212 20 15 10 5 0 43 48 52 57 61 65 70 74 78 83 87 91 96 100 Exam Score Students who… Exam 1 average Viewed pre-lectures Blew through pre-lectures 05 80% 73% Physics 211 Lecture 1, Slide 6 Physics Physics 211 Lecture 1 Today's Concepts: Kaboom a) Displacement, Velocity, Acceleration b) 1-D Kinematics with constant acceleration If you haven't done Prelecture 1 yet, please do so later today Everyone get full credit for today's activities Physics 211 Lecture 1, Slide 7 Physics Prelecture Example Physics 211 Lecture 1, Slide 8 Physics Prelecture Example Physics 211 Lecture 1, Slide 9 Physics Displacement and Velocity in One Dimension Displacement Time taken Physics 211 Lecture 1, Slide 10 Physics Displacement and Velocity in One Dimension Definition: Speed = |v(t)| Physics 211 Lecture 1, Slide 11 Physics Displacement and Velocity in One Dimension The v(t) vs. t plot is just the v(t vs. plot slope of the x(t) vs. t plot of x(t vs. plot You Try It A) Agree B) Disagree B) Physics 211 Lecture 1, Slide 12 Physics ACT 3 The velocity vs time plot of some time object is shown to the right. Which diagram below could be the Displacement vs time plot for the time same object? A B C Physics 211 Lecture 1, Slide 13 Physics Acceleration Physics 211 Lecture 1, Slide 14 Physics Preflight 1 For the Displacement and Velocity curves shown on the left, which is the correct plot of acceleration vs time? time? A B Physics 211 Lecture 1, Slide 15 Physics ACT 4 A B Typical A answer Typical When t is less than 0, the graph of v and t has a slop of negative values. So, the acceleration should be negative. Typical B answer Typical Vote The velocity is getting less and less until it hits zero and then it increases again through positive acceleration. Physics 211 Lecture 1, Slide 16 Physics Constant Acceleration constant a(t)=a Physics 211 Lecture 1, Slide 17 Physics Preflight 2 At t = 0 a ball, initially at rest, starts to roll down a ramp with constant acceleration. Suppose it moves 1 foot between t = 0 sec and t = 1 sec. between sec and sec How far does it move between t = 1 sec and t = 2 sec? sec and sec A) 1 foot foot B) 2 feet feet C) 3 feet D) 4 feet feet Ramp Demo E) 6 feet feet Physics 211 Lecture 1, Slide 18 Physics ACT 5 ? 4ft 1ft 9ft 16ft At t = 0 a ball, initially at rest, starts to roll down a ramp with constant acceleration. Suppose it moves 1 foot between t = 0 sec and t = 1 sec. between sec and sec How far does it move between t = 1 sec and t = 2 sec? sec and sec A) 1 foot foot B) 2 feet feet C) 3 feet D) 4 feet feet E) 6 feet feet Physics 211 Lecture 1, Slide 19 Physics 2ft 4ft 3ft 1ft 9ft 16ft 1ft 4ft Typical C answer Given the above, acceleration is 2 feet/s^2, recalculating that for t=2 gives a displacement of 4 feet, take away the displacement at t=1 gives a change in displacement of 3 feet Typical A answer If the ball has constant acceleration, it will travel at the same velocity and move an additional 1 foot. Typical B answer Typical Its velocity after 1 second is 1 m/s, so its velocity after 2 seconds is 2 m/s. Typical D answer Typical Just like gravity, we have a constant acceleration here. So if it moves 1ft in the first second, it will move 2^2 in the second second, so 4 ft. Physics 211 Lecture 1, Slide 20 Physics ...
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This note was uploaded on 09/22/2011 for the course PHYSICS 211 taught by Professor Selig during the Fall '10 term at University of Illinois, Urbana Champaign.

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